Seungwoo Jeon

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We demonstrate second-harmonic generation (SHG) in a silicon-carbide (SiC)-based heterostructure photonic crystal nanocavity by using a pulsed laser. We observe SHG light radiated from the SiC nanocavity and estimate the conversion efficiency in the cavity to be 2.59×10(-5) (=0.15  W(-1)) at an average input power of 0.17 mW. The near-field patterns and(More)
As logistics industry is being grown, the saving of logistic operating cost becomes the key of efficiency in many fields of industries. The saving of cost is possible by improvement of processing mechanism efficiently. Simply, if the locations of stored freights are managed on a real time by a certain system, then the cost to find stored freight such as(More)
Social networking site (SNS) messages can contain subjective traffic information, including congestion-related expressions such as “bad traffic” or “traffic is crazy”. Moreover, they also contain heterogeneous levels of location information, such as a point (latitude, longitude), a road, or an area name, which complicates the(More)
From a huge volume of text of emails and SNS, it is required to extract human relations to determine whether or not there exist illegal connections each other. A graph structure becomes very useful for giving better representation of human relations compared with the original plain text. In this paper, we propose a way of constructing graph from a number of(More)
To predict future traffic conditions in each road with unique spatiotemporal pattern, it is necessary to analyze the conditions based on historical traffic data and select time series forecasting methods which can be predicting next pattern for each road according to the analyzed results. Our goal is to create a new statistical model and a new system for(More)
Although CCTV is most frequently used for traffic monitoring, there arise problems as a result of which traffic flow needs to be checked manually. In this paper, we propose a new method for automatically calculating traffic volume and vehicle speed by pattern analysis using pixel data extracted from CCTV Video image. First, vertical and horizontal lines are(More)
Because the number of tactical moving object is tens of thousands and the location information of them should be updated in real time while moving, it must be able to manage a large amount of the target data and management of the future target is also required through the predicted query. We have proposed to manage the tactical moving objects using(More)